Compared to Rhino 5 the Rh7 make2d interface has been simplified (which I get), but also creates restrictions.
It seems to me the following two options are needed to bring back some flexibility on layers:
a) Offer an option for make2d to generate it’s layers within a layer of the user’s choice.
b) Offer the ability to centrally change the make2d layer defaults (linetypes, names, etc) so that it generates those new defaults every time.
Here is a scenario:
This example has three objects. Each object generates its own engineering drawing. With Rhino5 it was trivial to direct make2d to the appropriate “outlines” and “hidden lines” layer for each object.